一球悬铃木优良家系及优良单株的选择

以美国引进的北美悬铃木种源上海松江试验点5年生的试验林为材料，根据2004年底的试验结果，进行了优良家系及优良单株的选择。结果表明：在松江试验点，不同种源间和种源内的家系间存在明显遗传差异。根据表型选择的12个优良家系，其树高、胸径、材积方面分别比家系平均值高出6．5％、12．31％、28．54％；选出的16个优良单株，其树高、胸径、单株材积增幅分别为18．05％、38．79％、100．55％，其中这3个性状增幅最大的单株分别增加了44．07％、62．91％、224．92％。综合优良家系及优良单株的评选表明，适合松江点的材料多分布于美国中南部纬度偏北、经度偏东的地区。

Preliminary Selection of Superior Families and Plus Tree on Platanus occidentalis L.

A five years old provenances testing of Platanus occidentalis L. results was reported in this article,which was planted in Songjiang area of Shanghai, China. Based on the five years performance, the superior families and individual trees were selected according to the data at the end of 2004. The results were shown that 12 families among the provenances were grown faster over the family mean about 6. 5%,12.31% ,and 28. 54% in height,breast diameter and volume respectively. Sixteen selected individuals among the standing families were 18.05 %, 38. 79 %, 100. 55 % over family mean,which the fastest growing individuals increased 44. 07%,62.91% ,and 224.92% respectively. Combinating of the selection of superior families and individual tree selection,the author found that the distribution of the families fitting Songjiang area trend toward the more northern latitude and more eastern longitude of midsouth the United States of America.